Develop Reference

Can a Broadcast Receiver send information to an Activity only if it is active without starting a new Activity?

I have a broadcast receiver that gets triggered on geofencing events and either "clocks in" or "clocks out" with the server. If my application's "Attendance" activity is already open I would like it to display the clocking status change but I don't want the Broadcast Receiver to start the activity if it's not open - in other words display the change "live" while the activity is open only.
The way I imagine doing this is with the Broadcast Receiver sending an Intent to the activity but name "startActivity()" doesn't sound encouraging unless there are any special flags I can pass to prevent starting an Activity that isn't already open - I can't seem to find any.
The other option would be to constantly poll the value while the activity is open but it doesn't seem optimal so I would only use it if there wasn't another way and I can't think of a reason why it couldn't be possible with Intents.

There are several different ways to accomplish the same task. One is registering a listener like the following example:
MainActivity
public class MainActivity extends AppCompatActivity
{
#Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
Receiver.setOnReceiveListener(new Receiver.OnReceiveListener() {
public void onReceive(Context Context, Intent intent)
{
//Do something.
}
});
}
#Override
protected void onDestroy()
{
super.onDestroy();
Receiver.setOnReceiveListener(null);
}
}
Receiver
public class Receiver extends BroadcastReceiver
{
private static OnReceiveListener static_listener;
public static abstract interface OnReceiveListener
{
public void onReceive(Context context, Intent intent);
}
public static void setOnReceiveListener(OnReceiveListener listener)
{
static_listener = listener;
}
#Override
public final void onReceive(Context context, Intent intent)
{
if(static_listener != null) {
static_listener.onReceive(context, intent);
}
}
}

Just have your BroadcastReceiver send a broadcast Intent. Your Activity should register a listener from this broadcast Intent and if it gets triggered, it can update the UI.
Here's an example:
Declare a private member variable in your Activity:
private BroadcastReceiver receiver;
In Activity.onCreate(), register the BroadcastReceiver:
IntentFilter filter = new IntentFilter();
filter.addAction("my.package.name.CLOCK_STATUS_CHANGE");
receiver = new BroadcastReceiver() {
#Override
public void onReceive(Context context, Intent intent) {
// Here you can update the UI ...
}
};
registerReceiver(receiver, filter);
And in onDestroy() you can unregister it (probably not necessary, but cleaner):
if (receiver != null) {
unregisterReceiver(receiver);
receiver = null;
}
In your BroadcastReceiver that detects the geofencing event, you should create and send a broadcast Intent:
Intent broadcastIntent = new Intent("my.package.name.CLOCK_STATUS_CHANGE");
sendBroadcast(broadcastIntent);

Android: Service is killed and restarted after a while

I know that is a well known subject, but I have tried lot of things. I have an simple application, dedicated to a specific user, application has an mainActivity which is displaying some status on screen and it's starting two services, one is making request from a server (at every 5 minutes) and one which is sending sms and replay to server (at every ten minutes).
The application is running on a Samsung pocket 2 with Android 4.4.2, this device is used only for this application. While the device is connected to ADB the services are working just fine, but if I disconnect the phone and let it running normally, the services are killed repeatable and restarted after a while. The messaged are send with very much delay. I would be thankful for any suggestions.
Here is my code:
Main activity:
public class MainActivity extends Activity {
private TextView _internet;
private TextView _signal;
private TextView _server;
private BroadcastReceiver receiver;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
init();
IntentFilter intentFilter = new IntentFilter(Constants.SS);
receiverWorker();
registerReceiver(receiver, intentFilter);
startService(new Intent(this, RefreshDBService.class));
startService(new Intent(this, SmsService.class));
}
private void receiverWorker() {
receiver = new BroadcastReceiver() {
public void onReceive(Context arg0, Intent arg1) {
checkState();
}};
}
public void refreshButonClicked(View v) {
checkState();
}`
Here is my first service:
public class RefreshDBService extends Service {
private Thread _backgroundWork;
private ScheduledExecutorService scheduleTaskExecutor = Executors.newScheduledThreadPool(1);
private DataBaseOperations _dataSource;
#Override
public void onCreate() {
super.onCreate();
_dataSource = new DataBaseOperations(this);
_backgroundWork = new Thread(new Runnable() {
#Override
public void run() {
if(Checks.checkInternetConnection(getApplicationContext())){
if(ServerOperations.isServerAvailable(getApplicationContext())){
String inputData = ServerOperations.makeRequest(Constants.GET_DATA_ROUTE, ServerOperations.getMessagesFromServer(getApplicationContext()));
ArrayList<DataSmsObj> dataFromServer=null;
if(inputData!=null && !inputData.isEmpty()){
dataFromServer = ServerOperations.fromJsonToObjects(inputData);
if(dataFromServer.size()>0){
_dataSource.open();
_dataSource.insertDataFromServer(dataFromServer);
_dataSource.close();
}
}
System.out.println("check server for messages in pending status, received -> "+ dataFromServer.size());
}else{
System.out.println("no server");
sentErrorToUI(Constants.NO_SERVER);
}
}else{
System.out.println("no internet");
sentErrorToUI(Constants.NO_INTERNET);
}
}
});
}
public int onStartCommand(Intent intent, int flags, int startId) {
scheduleTaskExecutor.scheduleWithFixedDelay(_backgroundWork, 0, Constants.NEXT_CYCLE/2, TimeUnit.MINUTES);
return START_REDELIVER_INTENT;
}
#Override
public void onDestroy() {
super.onDestroy();
scheduleTaskExecutor.shutdownNow();
}
public IBinder onBind(Intent intent) {
return null;
}
private void sentErrorToUI(String message){
Intent intent = new Intent(Constants.SS);
intent.putExtra(Constants.SS, message);
System.out.println("trimit" +message);
sendBroadcast(intent);
}
}
And this is the second one:
public class SmsService extends Service {
private Thread _backgroundWork;
private ScheduledExecutorService scheduleTaskExecutor = Executors.newScheduledThreadPool(1);
private DataBaseOperations _dataSource;
#Override
public void onCreate() {
super.onCreate();
_dataSource = new DataBaseOperations(this);
_backgroundWork = new Thread(new Runnable() {
#Override
public void run() {
sendFeedbackToServer();
List<DataSmsObj> dataToSent = new ArrayList<DataSmsObj>();
_dataSource.open();
dataToSent = _dataSource.getDataToSent();
_dataSource.close();
System.out.println("messages to sent: "+ dataToSent.size());
for (int i = 0; i < dataToSent.size(); i++) {
//here the messages are send, the code is to long to put it here, but if is need i can do it afterwards
}
}
});
}
public int onStartCommand(Intent intent, int flags, int startId) {
scheduleTaskExecutor.scheduleWithFixedDelay(_backgroundWork, 0, Constants.NEXT_CYCLE, TimeUnit.MINUTES);
return START_REDELIVER_INTENT;
}
#Override
public void onDestroy() {
super.onDestroy();
scheduleTaskExecutor.shutdownNow();
public IBinder onBind(Intent intent) {
return null;
}

If you are using a background Service with a scheduled task, it could be killed by the system. The only way to prevent the killing is a foreground Service. Quoting the documentation:
A foreground service is a service that the user is actively aware of and is not a candidate for the system to kill when low on memory.
You have to call the method startForeground() inside your Service using a Notification to show it. For further information you can check: https://developer.android.com/guide/components/services.html#Foreground
By the way, I recommend you to use the new JobScheduler api above api 21.
https://developer.android.com/reference/android/app/job/JobScheduler.html

Android kills service based on priority stack.
Android: keeping a background service alive (preventing process death)
What is START_STICKY,START_NOT_STICKY and START_REDELIVER_INTENT Service
Above links might help you.

Your devices will sleeps if it is unplugged from computer . So, the solutions :
Use startForeground method to prevent service to be killed and/or use AlarmManager in order to charge event.
It is possible to use start_stiky flag but it just restarts the process if it killed by system.

android recognize if call has been answered

I'm trying to add to my broadcast receiver an if, so I will start a different activity if a call has been answered, to the regular activity I start usually, if the screen has just been turned on.
Now as you can see down here I have the class screenJump starting when the user wakes up phone.
I would like to start a phoneActivity I wrote when the user wakes up phone, but only when a call has been answered.
This is my service now.
public class MyService extends Service {
BroadcastReceiver bd;
public MyService() {
}
class ScreenReceiver extends BroadcastReceiver {
#Override
public void onReceive(Context context, Intent intent) {
Intent startupIntent = new Intent(context, ScreenJump.class);
startupIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
context.startActivity(startupIntent);
}
public ScreenReceiver()
{
}
}
#Override
public void onCreate()
{
super.onCreate();
IntentFilter filter = new IntentFilter(Intent.ACTION_USER_PRESENT);
bd = new ScreenReceiver();
registerReceiver(bd, filter);
}
}

Communication between Activity and Service

I am trying to make my own MusicPlayer for android. Where i came to a problem is running some things in background. Main activity manages GUI and up to now all the songs are playing. I wanted to separate GUI and music playing classes. I want to put music managing part in Service and leave other things as they are now.
My problem is that i can't organize communication between Activity and Service as lot of communication is happening between them including moving objects in both directions. I tried many techniques that I searched here on Stack Overflow but every time I had problems. I need Service to be able to send objects to Activity and vice versa. When I add widget i also want it to be able to communicate with Service.
Any tips are appreciated, if you need source code place comment bellow but now in this transition it became chaotic.
Is there any more advanced tutorial on this than calling one method that returns random number from service? :P
EDIT: Possible solution is to use RoboGuice library and move objects with injection

I have implemented communication between Activity and Service using Bind and Callbacks interface.
For sending data to the service I used Binder which retruns the Service instace to the Activity, and then the Activity can access public methods in the Service.
To send data back to the Activity from the Service, I used Callbacks interface like you are using when you want to communicate between Fragment and Activity.
Here is some code samples for each:
The following example shows Activity and Service bidirectional relationship:
The Activity has 2 buttons:
The first button will start and stop the service.
The second button will start a timer which runs in the service.
The service will update the Activity through callback with the timer progress.
My Activity:
//Activity implements the Callbacks interface which defined in the Service
public class MainActivity extends ActionBarActivity implements MyService.Callbacks{
ToggleButton toggleButton;
ToggleButton tbStartTask;
TextView tvServiceState;
TextView tvServiceOutput;
Intent serviceIntent;
MyService myService;
int seconds;
int minutes;
int hours;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
serviceIntent = new Intent(MainActivity.this, MyService.class);
setViewsWidgets();
}
private void setViewsWidgets() {
toggleButton = (ToggleButton)findViewById(R.id.toggleButton);
toggleButton.setOnClickListener(btListener);
tbStartTask = (ToggleButton)findViewById(R.id.tbStartServiceTask);
tbStartTask.setOnClickListener(btListener);
tvServiceState = (TextView)findViewById(R.id.tvServiceState);
tvServiceOutput = (TextView)findViewById(R.id.tvServiceOutput);
}
private ServiceConnection mConnection = new ServiceConnection() {
#Override
public void onServiceConnected(ComponentName className,
IBinder service) {
Toast.makeText(MainActivity.this, "onServiceConnected called", Toast.LENGTH_SHORT).show();
// We've binded to LocalService, cast the IBinder and get LocalService instance
MyService.LocalBinder binder = (MyService.LocalBinder) service;
myService = binder.getServiceInstance(); //Get instance of your service!
myService.registerClient(MainActivity.this); //Activity register in the service as client for callabcks!
tvServiceState.setText("Connected to service...");
tbStartTask.setEnabled(true);
}
#Override
public void onServiceDisconnected(ComponentName arg0) {
Toast.makeText(MainActivity.this, "onServiceDisconnected called", Toast.LENGTH_SHORT).show();
tvServiceState.setText("Service disconnected");
tbStartTask.setEnabled(false);
}
};
View.OnClickListener btListener = new View.OnClickListener() {
#Override
public void onClick(View v) {
if(v == toggleButton){
if(toggleButton.isChecked()){
startService(serviceIntent); //Starting the service
bindService(serviceIntent, mConnection, Context.BIND_AUTO_CREATE); //Binding to the service!
Toast.makeText(MainActivity.this, "Button checked", Toast.LENGTH_SHORT).show();
}else{
unbindService(mConnection);
stopService(serviceIntent);
Toast.makeText(MainActivity.this, "Button unchecked", Toast.LENGTH_SHORT).show();
tvServiceState.setText("Service disconnected");
tbStartTask.setEnabled(false);
}
}
if(v == tbStartTask){
if(tbStartTask.isChecked()){
myService.startCounter();
}else{
myService.stopCounter();
}
}
}
};
#Override
public void updateClient(long millis) {
seconds = (int) (millis / 1000) % 60 ;
minutes = (int) ((millis / (1000*60)) % 60);
hours = (int) ((millis / (1000*60*60)) % 24);
tvServiceOutput.setText((hours>0 ? String.format("%d:", hours) : "") + ((this.minutes<10 && this.hours > 0)? "0" + String.format("%d:", minutes) : String.format("%d:", minutes)) + (this.seconds<10 ? "0" + this.seconds: this.seconds));
}
}
And here is the service:
public class MyService extends Service {
NotificationManager notificationManager;
NotificationCompat.Builder mBuilder;
Callbacks activity;
private long startTime = 0;
private long millis = 0;
private final IBinder mBinder = new LocalBinder();
Handler handler = new Handler();
Runnable serviceRunnable = new Runnable() {
#Override
public void run() {
millis = System.currentTimeMillis() - startTime;
activity.updateClient(millis); //Update Activity (client) by the implementd callback
handler.postDelayed(this, 1000);
}
};
#Override
public int onStartCommand(Intent intent, int flags, int startId) {
//Do what you need in onStartCommand when service has been started
return START_NOT_STICKY;
}
#Override
public IBinder onBind(Intent intent) {
return mBinder;
}
//returns the instance of the service
public class LocalBinder extends Binder{
public MyService getServiceInstance(){
return MyService.this;
}
}
//Here Activity register to the service as Callbacks client
public void registerClient(Activity activity){
this.activity = (Callbacks)activity;
}
public void startCounter(){
startTime = System.currentTimeMillis();
handler.postDelayed(serviceRunnable, 0);
Toast.makeText(getApplicationContext(), "Counter started", Toast.LENGTH_SHORT).show();
}
public void stopCounter(){
handler.removeCallbacks(serviceRunnable);
}
//callbacks interface for communication with service clients!
public interface Callbacks{
public void updateClient(long data);
}
}

Update: July 10 2016
IMO I think using BroadcastReceiver for custom events is better way
as the Messengers mentioned don't handle activity recreation on device
rotation as well as possible memory leaks.
You may create custom BroadCast Receiver for events in the activity, Then you may also use Messengers.
In your Activity
create a MessageHandler class as
public static class MessageHandler extends Handler {
#Override
public void handleMessage(Message message) {
int state = message.arg1;
switch (state) {
case HIDE:
progressBar.setVisibility(View.GONE);
break;
case SHOW:
progressBar.setVisibility(View.VISIBLE);
break;
}
}
}
Now you can have it's instance as
public static Handler messageHandler = new MessageHandler();
Start your Service with this Handler object as an extra data as
Intent startService = new Intent(context, SERVICE.class)
startService.putExtra("MESSENGER", new Messenger(messageHandler));
context.startService(startService);
In your Service you receive this object from the intent and initialize the Messenger variable in Service as
private Messenger messageHandler;
Bundle extras = intent.getExtras();
messageHandler = (Messenger) extras.get("MESSENGER");
sendMessage(ProgressBarState.SHOW);
And then write a method sendMessage to send messages to activity.
public void sendMessage(ProgressBarState state) {
Message message = Message.obtain();
switch (state) {
case SHOW :
message.arg1 = Home.SHOW;
break;
case HIDE :
message.arg1 = Home.HIDE;
break;
}
try {
messageHandler.send(message);
} catch (RemoteException e) {
e.printStackTrace();
}
}
The sample code above shows and hides a ProgressBar in Activity as messages are received from Service.

Intents are good solution for communication between Activitiy and Service.
A fast solution for receive intents in your service is subclassing IntentService class. It handles asynchronous requests expressed as Intents using a queue and worker thread.
For communication from service to Activity you can broadcast the intent but instead of using normal sendBroadcast() from Context, a more efficent way is to use LocalBroadcastManager from support library.
Example service.
public class MyIntentService extends IntentService {
private static final String ACTION_FOO = "com.myapp.action.FOO";
private static final String EXTRA_PARAM_A = "com.myapp.extra.PARAM_A";
public static final String BROADCAST_ACTION_BAZ = "com.myapp.broadcast_action.FOO";
public static final String EXTRA_PARAM_B = "com.myapp.extra.PARAM_B";
// called by activity to communicate to service
public static void startActionFoo(Context context, String param1) {
Intent intent = new Intent(context, MyIntentService.class);
intent.setAction(ACTION_FOO);
intent.putExtra(EXTRA_PARAM1, param1);
context.startService(intent);
}
public MyIntentService() {
super("MyIntentService");
}
#Override
protected void onHandleIntent(Intent intent) {
if (intent != null) {
final String action = intent.getAction();
if (ACTION_FOO.equals(action)) {
final String param1 = intent.getStringExtra(EXTRA_PARAM_A);
// do something
}
}
}
// called to send data to Activity
public static void broadcastActionBaz(String param) {
Intent intent = new Intent(BROADCAST_ACTION_BAZ);
intent.putExtra(EXTRA_PARAM_B, param);
LocalBroadcastManager bm = LocalBroadcastManager.getInstance(this);
bm.sendBroadcast(intent);
}
}
Example Activity
public class MainActivity extends ActionBarActivity {
// handler for received data from service
private final BroadcastReceiver mBroadcastReceiver = new BroadcastReceiver() {
#Override
public void onReceive(Context context, Intent intent) {
if (intent.getAction().equals(MyIntentService.BROADCAST_ACTION_BAZ)) {
final String param = intent.getStringExtra(EXTRA_PARAM_B);
// do something
}
}
};
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
IntentFilter filter = new IntentFilter();
filter.addAction(MyIntentService.BROADCAST_ACTION_BAZ);
LocalBroadcastManager bm = LocalBroadcastManager.getInstance(this);
bm.registerReceiver(mBroadcastReceiver, filter);
}
#Override
protected void onDestroy() {
LocalBroadcastManager bm = LocalBroadcastManager.getInstance(this);
bm.unregisterReceiver(mBroadcastReceiver);
super.onDestroy();
}
// send data to MyService
protected void communicateToService(String parameter) {
MyIntentService.startActionFoo(this, parameter);
}
}

I think there is a problem with the correct answer. I have not enough reputation to comment on it.
Right in the answer:
Activity call bindService() to get pointer to Service is ok. Because service context is maintained when connection is maintained.
wrong in the answer:
service pointer to Activity class to call back is bad way. Activity instance maybe not null during Activity context is being Release => exception here.
solution for the wrong in the answer:
service send intent to Activity. and Activity receiver intent via BroadcastReceiver.
Note:
in this case, Service and Activity in the same Process, you should use LocalBroadcastManager to send intent. It make performance and security better

This is a simple example of communication between activity and service
Activity
MyReceiver myReceiver; //my global var receiver
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.layourAwesomexD);
registerReceiver();
}
//When the activity resume, the receiver is going to register...
#Override
protected void onResume() {
super.onResume();
checkStatusService(); // verficarStatusServicio(); <- name change
registerReceiver();
}
//when the activity stop, the receiver is going to unregister...
#Override
protected void onStop() {
unregisterReceiver(myReceiver); //unregister my receiver...
super.onStop();
}
//function to register receiver :3
private void registerReceiver(){
//Register BroadcastReceiver
//to receive event from our service
myReceiver = new MyReceiver();
IntentFilter intentFilter = new IntentFilter();
intentFilter.addAction(MyService.SENDMESAGGE);
registerReceiver(myReceiver, intentFilter);
}
// class of receiver, the magic is here...
private class MyReceiver extends BroadcastReceiver {
#Override
public void onReceive(Context arg0, Intent arg1) {
//verify if the extra var exist
System.out.println(arg1.hasExtra("message")); // true or false
//another example...
System.out.println(arg1.getExtras().containsKey("message")); // true or false
//if var exist only print or do some stuff
if (arg1.hasExtra("message")) {
//do what you want to
System.out.println(arg1.getStringExtra("message"));
}
}
}
public void checkStatusService(){
if(MyService.serviceStatus!=null){
if(MyService.serviceStatus == true){
//do something
//textview.text("Service is running");
}else{
//do something
//textview.text("Service is not running");
}
}
}
Service
public class MyService extends Service {
final static String SENDMESAGGE = "passMessage";
public static Boolean serviceStatus = false;
#Override
public void onCreate() {
super.onCreate();
serviceStatus=true;
}
#Nullable
#Override
public IBinder onBind(Intent intent) {return null;}
#Override
public int onStartCommand(Intent intent, int flags, int startId) {
//you service etc...
passMessageToActivity("hello my friend this an example of send a string...");
return START_STICKY;
}
#Override
public void onDestroy() {
super.onDestroy();
passMessageToActivity("The service is finished, This is going to be more cooler than the heart of your ex...");
System.out.println("onDestroy");
serviceStatus=false;
}
private void passMessageToActivity(String message){
Intent intent = new Intent();
intent.setAction(SENDMESAGGE);
intent.putExtra("message",message);
sendBroadcast(intent);
}
}
if we don't unregister BroadcastReceiver we will have an error, you need to unregister when the activity go onPause, onStop, onDestroy...
if you don't register BroadcastReceiver when you back to activity, it will not listen anything from the service... the service will send information to BroadcastReceiver but it will not receive anything because it isn't registered.
When you create more than one service, the following services are going to begin in onStartCommand.
You can pass information to service with intent and you get it in onStartCommand
Difference about return in onStartCommand: Difference between START_STICKY and START_REDELIVER_INTENT? and check the official website of google: Services

The best way in this case is to communicate by doing broadcasting from your service for different actions and receiving it in your activity. You can create a custom broadcast and send some codes defining specific events like complete, change, prepare etc...

Most easy and efficient way will be using EventBus from GreenRobot.
Use simple 3 steps:
1 Define events
public static class MessageEvent { /* Additional fields if needed */ }
2 Prepare subscribers: Declare and annotate your subscribing method, optionally specify a thread mode:
#Subscribe(threadMode = ThreadMode.MAIN)
public void onMessageEvent(MessageEvent event) {/* Do something */};
Register and unregister your subscriber. For example on Android, activities and fragments should usually register according to their life cycle:
#Override
public void onStart() {
super.onStart();
EventBus.getDefault().register(this);
}
#Override
public void onStop() {
super.onStop();
EventBus.getDefault().unregister(this);
}
3 Post events:
EventBus.getDefault().post(new MessageEvent());

Very easy yet powerful way is to use EventBus you can add it to your gradle build and enjoy the easy publisher/subscriber pattern .

Register Battery Changed broadcast in Android service

I'm starting a service from an Activity. The service registers for Battery Changed broadcast Receiver. I receive broadcasts as long as the screen is ON. Once the screen is turned OFF, I stop receiving broadcasts, however, the service doesn't die.
My activity code,
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
context = this.getApplicationContext();
Intent intent = new Intent(this,BatteryStatusService.class);
startService(intent);
}
and my service code,
public class BatteryStatusService extends Service{
private final static String TAG = BatteryStatusService.class.getSimpleName();
private BroadcastReceiver timeTickReceiver;//changeReceiver;
private boolean registered = false;
public class LocalBinder extends Binder {
BatteryStatusService getService() {
return BatteryStatusService.this;
}
}
private final IBinder mBinder = new LocalBinder();
#Override
public void onStart(Intent intent, int startId){
Log.i(TAG,"Starting service");
IntentFilter filter = new IntentFilter();
filter.addAction(Constants.ACTION_BATTERY_CHANGED);
timeTickReceiver = new TimeTickReceiver();
this.getApplicationContext().registerReceiver(timeTickReceiver, filter);
registered = true;
}
#Override
public void onDestroy(){
Log.d(TAG,"Stopping service");
if(registered){
this.getApplicationContext().unregisterReceiver(timeTickReceiver);
}
}
#Override
public IBinder onBind(Intent intent) {
// TODO Auto-generated method stub
return mBinder;
}
public class TimeTickReceiver extends BroadcastReceiver {
private String action = null;
private final String TAG = TimeTickReceiver.class.getSimpleName();
#Override
public void onReceive(Context context, Intent intent) {
action = intent.getAction();
if(action.equals(Constants.ACTION_BATTERY_CHANGED)){
Log.d(TAG,"I got action = "+action);
}
}
}
}
}

use AlarmManager and get last broadcasted level with
Intent BATTERYintent=this.registerReceiver(null, new IntentFilter(Intent.ACTION_BATTERY_CHANGED));
However there are mobiles where it would work either. I have t-mobile MOVE which will not update battery value/broadcast no matter what in sleep mode... but most mobiles will do it as they should
by the way dont listen to dcanh121 there are cases when u need to get battery level even when phone is in sleepmode.

Once the screen is turned OFF, I stop receiving broadcasts, however, the service doesn't die.
When the screen is turned off, shortly thereafter the device goes into sleep mode. Your code does not execute again until something wakes up the device from sleep mode.
Also:
You do not need to use getApplicationContext() here
You do not need a Binder here, since you are not binding to the service, so just have onBind() return null
You need to have some code somewhere to stop this service, so it does not run forever

why don't you try by using onResume() and onPause()